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31 results on '"Xiao, Yingfang"'

7. Distribution of Scirtothrips dorsalis(Thysanoptera: Thripidae) cryptic species complex in the United States and reproductive host assessment of its dominant member

Author

Kumar, Vivek, Xiao, Yingfang, Borden, Matthew A, Ahmed, Muhammad Z, McKenzie, Cindy L, and Osborne, Lance S

Abstract

Chilli thrips, Scirtothrips dorsalisHood, is a cryptic species complex of at least 9 species, 2 of which (South Asia 1 and East Asia 1) have been confirmed damaging >50 plant taxa in the United States. To develop a knowledge-based management program for this pest in the United States, the objectives of the study were to (i) survey for S. dorsalisspecies complex in the suspected regions and (ii) assess the reproductive hosts of the predominant member available. Thrips samples received from collaborators were subjected to morpholo-molecular characterization. Of the 101 thrips populations received across the United States between 2015 and 2021, 71 populations were confirmed as S. dorsalis, with ~25% further identified as East Asia 1, compared with ~41% identified as South Asia 1, suggesting the latter species is more prevalent in the US. East Asia 1 was primarily found in samples collected from Hydrangeasp. (95%) in Massachusetts, New York, and Pennsylvania, indicating geographic range expansion in the Northeast and successful overwintering in areas with hard freezes. While assessing the host range of South Asia 1 (dominant species), 62 plant taxa were evaluated under greenhouse conditions. Among these, 40 feeding and reproductive hosts were confirmed in Florida. We also found 18 new reproductive hosts and 3 feeding hosts of S. dorsalis, which were not previously reported in the literature. The results provide insight into the increasing host range and expanded geographical distribution of S. dorsalisspecies and will enable the development of a species-specific monitoring and management program.

Published
2023
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14. Laboratory Bioassay and Field Evaluation of Copper Gluconate as a New Potential Bactericide Against Xanthomonas campestris pv. citri (Hasse) Dye

Author

Runqian Mao, Quan Jincheng, Xiao Yingfang, Mingli Tang, Jihuan Zheng, and Zhang Yuhong

Subjects
Copper gluconate, biology, Serial dilution, chemistry.chemical_element, biology.organism_classification, Copper, Xanthomonas campestris, Microbiology, chemistry.chemical_compound, chemistry, Adipate, Citrus canker, Bioassay, Mancozeb, Nuclear chemistry
Abstract

Laboratory bioassays and field trials were carried out to study the toxicity and effectiveness of copper gluconate (CG) against Xanthomonas campestris pv. citri (Hasse) in comparison with copper hydroxide (CH) and DT (copper succinate + copper glutarate + copper adipate). The results of laboratory experiment indicated that CG recorded significant control against the bacteria at the concentration of 40 g/L or more. In particular, CG had a similar result to those of CH at the concentration of 100 g/L. Meanwhile, field experiment confirmed that CG had a similar efficacy compared with those of CH, DT, and Mancozeb. It was suggested that CG (1: 1000 dilutions) could be used as effective bactericide for managing citrus canker.

Published
2013
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31. Biology, Ecology, and Management of Key Pests of Satsuma Citrus in Alabama

Author

Xiao, Yingfang

Subjects
Entomology and Plant Pathology
Abstract

Satsuma mandarin (Citrus unshiu Marcovitch) production is an emerging industry in Alabama. Recent surveys identified Leptoglossus zonatus (leaffooted bug), Phyllocnistis citrella (citrus leafminer), and Panonychus citri (citrus red mite), as important pests of satsuma in Alabama. My dissertation comprised of three sections with the focus on the ecology and management of the above three key pests, and included laboratory and field studies. The first section (chapters II and III) focused on L. zonatus. Host preference and development of L. zonatus was studied in chapter II. The results showed that tomato was the most preferred fruit, but satsuma is also a suitable host. Damage to satsuma by L. zonatus was evaluated in chapter III. Feeding by L. zonatus on satsuma produced external damage, and resulted in significant fruit weight loss, fruit abortion, and reduced soluble solids content (SSC). Section 2 (chapters IV and V) focused on P. citrella. The seasonal phenology and natural enemy fauna of P. citrella in Alabama was investigated in chapter IV. The results showed multiple overlapping generations of P. citrella, and effective pheromone-baited traps were identified. At least 21 species of beneficial arthropods were recorded. In chapter V, I investigated the relative contributions of key beneficial arthropods to natural mortality of P. citrella in Alabama using exclusion techniques. Predation by spiders was the most important natural mortality factor, whereas parasitism was minimal. Section 3 (chapters VI and VII) focused on P. citri. Chapter VI presented a laboratory evaluation of three commercially available predacious mite species in the family Phytoseiidae (Phytoseiulus persimilis, Galendromus occidentalis, and Neoseiulus californicus), as potential biological control agents of P. citri. All three species were effective in regulating P. citri density, but P. persimilis showed the highest predation potential followed by G. occidentalis. The results of field evaluations of small-scale releases of P. persimilis or G. occidentalis against P. citri (chapter VII) showed that two timed releases of either species at an appropriate release rate (100 or more per tree) provided effective season-long suppression of P. citri. These results support the development of an IPM program for satsuma production in the Gulf Coast region.

Published
2009

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